I really appreciate advise and encouragement, however, I feel like there isn't much I can do myself at this point. I put my finger on the white line, and I feel no suction whatsoever. Furthermore, now that my front air is going through defrost mode only, I followed vindctar's advise and checked for suction on 4 wires connecting to 2 valves in the front (just above to the right of gas pedal). I felt no air coming in or out of any of the wires. I was not able to test VCMs with my finger - could not push down on the lever and plug 2 holes at the same time. I am making an assumption there is a vacuum leak somewhere, but I have no experience in testing it, replacing it etc. Like I said before, I am no car mechanic, I just take things apart if they don't work, and most of the time can figure out what's wrong. So my question is this: 1. could it be front heat/air switch that's wrong? My guess is not, as replacing rear control switch did not fix the rear problem. If you guys think it could be the switch, I will pay Ford $32 they want for it and give it a try. If it is a vacuum leak, all I need to know is whether it's something I should even try to fix myself, or just take it to a mechanic. I do not want to waste your time if you think this is way over my head. If you agree with taking it to the shop, how much should I be prepared to pay for fixing this problem. Thank you again to all. If you believe there is another troubleshooting step I can complete myself, feel free to let me know. | 
